//////////////////////////////////////////////////////////////////////////
//
//  Copyright (c) 2012, John Haddon. All rights reserved.
//
//  Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are
//  met:
//
//      * Redistributions of source code must retain the above
//        copyright notice, this list of conditions and the following
//        disclaimer.
//
//      * Redistributions in binary form must reproduce the above
//        copyright notice, this list of conditions and the following
//        disclaimer in the documentation and/or other materials provided with
//        the distribution.
//
//      * Neither the name of John Haddon nor the names of
//        any other contributors to this software may be used to endorse or
//        promote products derived from this software without specific prior
//        written permission.
//
//  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
//  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
//  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
//  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
//  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
//  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
//  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
//  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
//  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
//  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
//  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
//////////////////////////////////////////////////////////////////////////

#include "Gaffer/TimeWarp.h"

#include "Gaffer/Context.h"
#include "Gaffer/ContextAlgo.h"

using namespace Gaffer;

GAFFER_NODE_DEFINE_TYPE( TimeWarp );

size_t TimeWarp::g_firstPlugIndex;

TimeWarp::TimeWarp( const std::string &name )
	:	ContextProcessor( name )
{
	storeIndexOfNextChild( g_firstPlugIndex );
	addChild( new FloatPlug( "speed", Plug::In, 1.0f ) );
	addChild( new FloatPlug( "offset" ) );
}

TimeWarp::~TimeWarp()
{
}

FloatPlug *TimeWarp::speedPlug()
{
	return getChild<FloatPlug>( g_firstPlugIndex );
}

const FloatPlug *TimeWarp::speedPlug() const
{
	return getChild<FloatPlug>( g_firstPlugIndex );
}

FloatPlug *TimeWarp::offsetPlug()
{
	return getChild<FloatPlug>( g_firstPlugIndex + 1 );
}

const FloatPlug *TimeWarp::offsetPlug() const
{
	return getChild<FloatPlug>( g_firstPlugIndex + 1 );
}

bool TimeWarp::affectsContext( const Plug *input ) const
{
	return input == speedPlug() || input == offsetPlug();
}

void TimeWarp::processContext( Context::EditableScope &scope, IECore::ConstRefCountedPtr &storage ) const
{
	scope.setFrame(
		scope.context()->getFrame() * speedPlug()->getValue() + offsetPlug()->getValue()
	);
}
